Skip to content
WebToolShop WebToolShop

BMI Calculator — free online tool

Fitness trackers and clinics often cite Body Mass Index as a rough screening metric. Enter height in centimetres and weight in kilograms to see BMI and the usual category band (underweight through obese).

Cross-check anything that affects money or health with a qualified professional or official source.

How to use BMI Calculator

  1. Enter your weight in kilograms and height in centimetres on the BMI Calculator.
  2. Press calculate to display BMI and the usual category label (underweight through obese).
  3. Adjust either value to see how the index moves—for example after a fitness goal.
  4. Treat the category as screening only, not a diagnosis from Webtoolshop.

Practical tips

  • BMI is a rough screen, not a body-fat measure—athletes with muscle often read as "overweight".
  • Use consistent units (cm and kg) so the category band matches standard WHO ranges.
  • Treat the result as a conversation starter with a doctor, not a diagnosis.

Limitations

BMI Calculator uses simplified formulas. Tax brackets, bank rounding, leap seconds, and regional holidays are not modelled—confirm important totals with an official calculator or advisor.

Privacy & data

For this calculator-style page, numbers and dates stay in your browser memory until you leave. They are not saved to our servers.

Frequently asked questions about BMI Calculator

Is the BMI Calculator free on Webtoolshop?

Yes. There is no sign-in and no paywall on this page. We may show advertising on some layouts to cover hosting.

Can I use the BMI Calculator on a phone?

Yes for light tasks. Very long pasted text, huge images, or multi-megabyte PDFs are easier on a laptop with more memory.

Can I use the BMI Calculator for official tax, loan, or medical decisions?

No. Results are simplified estimates for learning and quick checks. Confirm figures with a qualified professional, lender, or government source before filing or signing contracts.

Where does my input go when I use the BMI Calculator?

For this calculator-style page, numbers and dates stay in your browser memory until you leave. They are not saved to our servers.

BMI Calculator

Body Mass Index using metric weight (kg) and height (cm).

For adults; bands are a general guide — not medical advice.

Copied!